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http://dx.doi.org/10.5369/JSST.2002.11.1.048

Ferroelectric Properties of Pb[(Zr,Sn)Ti]NbO3 Thin Films with Various Composition Ratio  

Choi, Woo-Chang (Hanla Level Co., Ltd.)
Choi, Hyek-Hwan (Department of Electronic Engineering, PuKyong National University)
Lee, Myoung-Kyo (Department of Electronic Engineering, PuKyong National University)
Kwon, Tae-Ha (Department of Electronic Engineering, PuKyong National University)
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Abstract
Ferroelectric $Pb_{0.99}[(Zr_{0.6}Sn_{0.4})_{1-x}Ti_x]_{0.98}Nb_{0.02}O_3$(PNZST) thin films were deposited by a RF magnetron sputtering on $(La_{0.5}Sr_{0.5})CoO_3$(LSCO)/Pt/Ti/$SiO_2$/Si substrate using a PNZST target with excess PbO of 10 mole%. The crystallinity and electrical properties of the thin films with various composition ratio were investigated. The thin films deposited at the substrate temperature of $500^{\circ}C$ and the power of 80 W were crystallized to a perovskite phase after rapid thermal annealing(RTA) at $650^{\circ}C$ for 10 seconds in air. A PNZST thin films with Ti of 10 mole% showed the good crystallinity and ferroelectric properties. The remanent polarization and coercive field of the PNZST capacitor were about $20\;{\mu}C/cm^2$ and 50 kV/cm, respectively. The reduction of the polarization after $2.2{\times}10^9$ switching cycles was less than 10%.
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